Theses are the dates for 2019.
March 31st, April 21st, May 19th, June 9th & 23ed, July 14th & 28th, August 11th & 25th, September 15th & 29th and October 20th. All these dates are on a Sunday.
May 4th, July 6th, and September 7th.
Tickets on sale December 1st, walking tour vouchers available now and will be valid for next season.